Here is a link to "The Grand Prix Legends Shock Force Chart" that Lee Bowden, (Lee200), posted awhile back.
Note that 50/50 shocks, (a baseline for tuning), in the setup menu corresponds to 4 in bump and 1 in rebound.
This is because the setup menu has a built-in 1967 F1 historically accurate 1:3 ratio of compression to release.
So, 1/1 is softer than 5/5, but for both the ratio of bump to rebound is 1:3.

10. In general, stiffening one end of the car will reduce the mechanical grip on that end. In other words, when you raise the spring rate, increase sway bar size or stiffness, stiffen the bump or rebound of a shock, install firmer bushings, etc. you will reduce the grip on that end and decrease traction. To increase grip you must lower the spring rate, increase the sway bar size of stiffness, soften the shocks, use softer bushings, etc. (Tire pressure is another contributing factor, but that's a discussion for another day.)"

Then later on regarding tuning rebound on Koni shocks:

"It should be noted that too much rebound on either end of the vehicle will cause an initial loss of lateral acceleration (cornering grip) a that end which will cause the vehicle to oversteer or understeer excessively when entering a turn. Too much rebound control in relation to spring rate will cause a condition known as "jacking down." This is a condition where, after hitting a bump and compressing the spring, the damper does not allow the spring to return to a neutral position before the next bump is encountered."

Sorry for being ignorant on the matter but if the ratio is 1:3 shouldn't be the neutral value 3 bump and 1 rebound instead of 4 and 1 ?

Check out the chart and see that line representing 4 in bump is mirror of line for 1 in rebound. So 4/1 is 50/50.
Then check lines for any combo of 1/1, 2/2, etc and see they are in ratio of...somewhere between 1/2 and 1/3?

Actually looks to me now like GPL shock chart shows force ratio is closer to 1/2 than 1/3, and/but as I understand authentic ratio is closer to 1/3?

Guessing...its the rate that is 1/3?

Notice that for 1B/1R, it takes three times longer to get to value of -50 (bump) than it does to +50 (rebound).
It also shows that stiffer shocks are faster to same force value than soft.

Curious about bump number being negative.
Guess that makes sense, but shock rate has always been referred to as "added"?
Or its that spring rate when in bump is negative?

Thnx RF, really just trying to get enough all in one place to give others a good start if they are interested and me a good place to get back to because I forget everything.
Any ideas/contributions would be welcomed for sure.
BTW, if you search SRMZ for Lee's posts its like an encyclopedia of Grand Prix Legends good stuff to know.